To provide a jaw crusher advantageous for resetting a discharge width of a crushing chamber to the target dimension according to the progress of abrasion of a tooth plate regardless of the properties and size of a material to be crushed.

In the jaw crusher 20 which includes a crusher frame 41, fixed teeth 42 fixed to the crusher frame 41, and movable teeth 43 forming the crushing chamber 49 between them and the fixed teeth 42 and oscillating to the fixed teeth 42, the fixed teeth 42 and the movable teeth 43 respectively have a plurality of vertically extending rows of mountains 61 on the opposite side, respective mountains 61 are formed so as to face valleys 62 of the counterpart, and a space G1 between a mountain 61a located nearest to the side wall of the crushing chamber 49 and a valley 62a facing the mountain 61a is formed larger than a space G2 between other mountains 61 and the valleys 62 facing the other mountains 61.